What's the rhyme associated with Ivermectin as a reminder about which breeds of dogs not to use it on? Something about white tipped toes..

http://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CCsQFjAA&url=http%3A%2F%2Fwww.petfinder.com%2Fdogs%2Fdog-health%2Fdogs-invermectin-overdoes%2F&ei=rV9sUvyRBIjhyQGP5oH4AQ&usg=AFQjCNGKlUU7h6pmxbrxN2fUAdXaO9n7Mg&sig2=rCNzLEjUqXbgLj_ZQ_PiPw&bvm=bv.55123115,d.b2I

White feet, don't treat,

http://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CCsQFjAA&url=http%3A%2F%2Fwww.petfinder.com%2Fdogs%2Fdog-health%2Fdogs-invermectin-overdoes%2F&ei=rV9sUvyRBIjhyQGP5oH4AQ&usg=AFQjCNGKlUU7h6pmxbrxN2fUAdXaO9n7Mg&sig2=rCNzLEjUqXbgLj_ZQ_PiPw&bvm=bv.55123115,d.b2I

White feet, don’t treat,

Yes! Thank you! It's been bugging me for a while now. :D

Why won't it let me give you thumbs up? How do I spread reputation? Wait! That's another askmehelpdesk question! :) thanks again.